6 Pcs Golden Converter Presta to Schrader Bicycle Bike Valve Adaptor Tube Pump Tool Material: Zinc Alloy ( Copper Plated ) Size: Approx.15mm x 9mm x7mm.(L*Big head diameter*Small head diameter) Color: Golden Used with a Bicycle Pump or a Air Compressor. Convert a Presta valve to a Schrader valve